Air purifier



FIG. 1 is a perspective view of an air purifier showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines illustrate portions of the air purifier which form no part of the claimed design.

The curved shading in FIG. 1 and FIG. 2 illustrates that the outer section is a concave surface. 

CLAIM The ornamental design for an air purifier, as shown and described. 